The adjustment screws/nuts should be located either on the top of the headlamp assembly,
behind the headlamp assembly, or near the frame rail by the radiator
support.

You will have vertical adjustment screws for each independent beam
(separate highs and separate lows, but will be same screw if highs and
lows are the same bulb). You may also have additional horizontal
adjustment screws as well

Park
your car on a level ground 30 feet from a wall and measure the height
from the ground to the bulb and mark on a wall (do this for highs beams
and low beams if the bulbs are separate, if highs and lows are the same
bulb, only do it for the lows)

For Low Beams: If the headlights read VOR, then
aim the brightest part or cutoff part just below the mark on the wall.
If it says VOL or nothing, aim them 2 inches below the mark on the wall.

For High Beams (if separate from low beams): Aim the headlight directly at the line you marked on the wall.

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Are your headlights beams too high? too low? Then bear with me and maybe I can help
Horizontal headlight adjustment is easy. See the screw on the inside top of each light? turn the screw left and your headlight beam goes outward; turn the screw right and the beam goes inward, (toward the center.)
Okay now Vertical adjustment is a little more involved. Start by removing the corner lens; take out the screw on top of the headlight and pull the corner lens forward. This will allow you to access two 10mm bolts holding the headlights in on the sides.
Remove those, along with one 10mm nut on the backside of the headlight assembly (near where your bulbs plug in). Remove your headlight bulbs carefully - I usually put a paper towel around them to protect them from dirt and oil. Now the only thing holding your light housings on are the horizontal adjustment
screws. Just slide the screws out from the lens, and then remove the headlight from the car.
If you look at your headlights now, there is another screw that looks just like the horizontal adjustment screw.
In order to adjust this, you need to remove the 10mm bolt labeled "A".
Now slide the plastic headlight base off of that bolt. The whole plastic base will now be free to swivel on the adjustment screw. What you need to do now is to turn the plastic base around the screw; if you turn it clockwise or right, it will lower your headlight beam when reinstalled. If you turn it left, it will raise the beams.
I ended up only turning each side lower by one revolution. You shouldn't need more than one or two turns. It also becomes hard to slide the housing back over the "A" bolt after two turns. If
in doubt about whether the beams will be raised or lowered, on the final pic you can see the clean area of the bolt on the left side. if you lengthen this side, it causes the beam to go down.
Its really easier to understand as you are doing it, if this does not seem clear. Just use some common sense and you'll see what I mean.
Installation is the reverse of removal.

1.Remove the two upper screws from the headlight housing, using a Phillips screwdriver.

.Locate the two lower retaining nuts inside the engine compartment at the bottom of the headlight housing. Remove the nuts using a ratchet, extension and socket.

Separate the turn signal and marker light assembly from the front grill. Rotate the bulb holders counterclockwise and pull them out of the assembly. Set the assembly aside.

Unplug the headlight bulb connector from the bulb. Rotate the retaining ring counterclockwise one-eighth turn and remove it from the housing. Pull the headlight bulb straight back and out of the housing. Do not rotate the bulb during disassembly.

Lift up on the headlight housing retaining clips to unsnap them from the headlight housing vertical adjuster studs.

Locate the horizontal adjuster at the outer bottom corner of the headlight assembly inside the engine compartment. Loosen the horizontal adjuster until it is free of the adjuster nut.

Insert the headlight bulb into the headlight housing, flat side up. Slightly rotate the headlight bulb to engage the grooves in the light with the alignment tabs in the back of the housing. Install the retaining ring on the bulb. Plug in the headlight bulb connector.

Install the bulb holders in the turn signal and marker light assembly. Install the assembly in the grill. Install the two upper screws, using a Phillips screwdriver. Install the two lower retaining nuts, using a ratchet, extension and socket.

Headlight Aiming

Pull the vehicle to within a few inches of a blank wall, on a flat surface. Apply two strips of tape to the wall vertically to mark the centers of the headlights. Apply a strip of tape to the wall horizontally to mark the center of the headlight height. Back the vehicle up 25 feet in a straight line.

Turn the headlight low beams to the "On" position.

Adjust the vertical headlight adjusters until the high-intensity zone of the light pattern is two inches below the horizontal mark on the wall.

Adjust the horizontal headlight adjusters until the high-intensity zone of the light pattern is two inches to the right of the vertical headlight marks on the wall.

I would try taking the headlight out and try refitting it again the headlights should not go out of alignment just because you change a bulb,(check the plastic nut at back of the headlight near the top) however the if you need to adjust it the adjusters are on the plate that the headlight sits on you will need a torque bit to loosen off the screws to adjust them

Look for a pin on top of the headlight assembly and for another on the side of the assembly, near the mid-line of the Buick. The top pin controls the vertical alignment of the headlight, and the side pin controls the horizontal alignment.Insert the screwdriver into each pin and twist to adjust the headlight beam .Be careful not to over-tighten.Its like a screw.------------- This will help.Thanks.Helpmech.

The best way to do it is to park your car in front on a garage door, a building or put a piece of plywood in front. Whichever you use, park you car at least 10 feet away; so you can tell if you are going up, down or in the middle when adjusting.

Remove the four screws that secure the headlight trim bezel to the grille.

Remove the headlight trim bezel.

Turn the headlight high beams on.

Adjust the headlights. Use the adjustment screws located
along the outboard side and the inboard lower corner of the headlight
bucket. Adjust the headlights until the beams are centered directly on the wall.

Park your vehicle on level ground with the headlights near a garage door or wall. A good distance is 2-3 feet away from the wall or door. The location must be perfectly level and flat at a distance of 10 to 25 feet away from the door or wall.Switch on the low headlight beams and mark the horizontal and vertical centerlines of each headlight beams on the wall using masking tape. This will mark the center of each beam with a +. The marking will tell you where exactly the headlight beams should be centered from a distance. Move the vehicle back about 10 to 25 feet away from the garage door or the wall.

Keep the headlights on the low beam setting. Use the markings you made on the wall or garage door to, check where the light shines and see if the centerlines still match up with the masking tape marks. If the centerlines of the two beams do not align with the tape marks, you can adjust one or both sides as needed.

Make the necessary adjustments with the lights still on while watching the light beams on the wall and your marks. Turning the top adjusting screws in a clockwise direction will raise the beam while counterclockwise turn will lower it.

Turning the side adjuster screws will adjust the lights to the left or right.

Continue the adjustments until the center of the light beams are aligned with the tape marks. Then adjust the vertical alignment of both beams slightly below the marks on the wall. This will assure that the lights are tilted slightly downward so they won’t blind approaching motorist.

The will align bot lights, the high and low sine both are connected to the same headlight!!

The adjustment screws/nuts should be located either on the top of the headlamp assembly,
behind the headlamp assembly, or near the frame rail by the radiator
support.

You will have vertical adjustment screws for each independent beam
(separate highs and separate lows, but will be same screw if highs and
lows are the same bulb). You may also have additional horizontal
adjustment screws as well

Park
your car on a level ground 30 feet from a wall and measure the height
from the ground to the bulb and mark on a wall (do this for highs beams
and low beams if the bulbs are separate, if highs and lows are the same
bulb, only do it for the lows)

For Low Beams: If the headlights read VOR, then
aim the brightest part or cutoff part just below the mark on the wall.
If it says VOL or nothing, aim them 2 inches below the mark on the wall.

For High Beams (if separate from low beams): Aim the headlight directly at the line you marked on the wall.